have a 2009 sporty,has vibration at 140ks.

tyres right pressure,belt adjustment ok.

any  idea,s...

is it just @ speed or have you checked what RPM in other gears it at can be engine resonating thru frame (harmonics)

Tony

start with checking that all your engine mounts and bolts are tight.
T1

have your wheels front & rear rebalance as most shops don't balance the rear ? or the weight's could have fallen off esp if they spoke wheels .

thanks will try all of that....